var currentSlide = 3s;
var slides = document.querySelectorAll( ".scroll img");
var slideCount = slides.length;
var slideInterval = setInterval(nextSlide, 3000);
function nextSlide() {
    slides[currentSlide].classList.remove('active');
    currentSlide = (currentSlide + 1) % slideCount;
    slides[currentSlide].classList.add('active');
	setInterval(nextSlide, 3000);
}
// 219980520李馨